Compilation Research And Application In Design Specification Of Subway For Power Supply (New Edition)

According to the experience of recension, compilation and application of Power Supply System Section in the national standard Code for Design of Metro (GB50157-2003), the author wrote this article. On the basis of analyzing and summarizing the implementations of the old national standard Code for the design of metro, this article provide important supports for the recension and compilation of the Standard by studying some key problems during the compilation. And also, analyzing the amendment and suggestions of the exposure draft and censor draft are helpful to supplement and complete the new Standard. By contrastively analyzing the new and old Standards, and furthermore comparing the Code for Design of Metro and foreign standards, trade standards and local standards, this article provide convenience for the engineering application of the Code for Design of Metro, and it will benefit the study, implementation and application of the new Standard, and will promote the continuable development of the construction of Chinese urban rail transit.In the beginning of the article, the summarized analysis is performed for the application of the old standard Code for the design of metro. After analyzing the general problems of the old Standard, the author analyzed the detailed problems of Power Supply System Section of the old Standard, and collected and itemized the problems and suggestions during the period of implementation of old Standard as the preconditions of the recension of the Standard. And then, some important problems are studied emphasized, it includes: analyzing the functions and composing of power supply system of urban rail transit; middle voltage network and introduce of 20kV voltage grade, analyzing and studying the unilateral and bilateral power supply mode of traction network, analyzing the classification of electrical loads and their requirements for power supply in metro, feasibility analysis of the earthing device by natural earthing electrodes, study of the relations of the layout between power cable and communication & signal cable. All of the production of study will be used directly in related clauses of the new Standard and will be important requirements of the new Standard. It will provide technical supports for the recension of the Standard. Otherwise, the amendment and suggestions of the exposure draft and censor draft are itemized in this article. Finally, in order to be convenient for the actual application of new Standard, the author analyzed the new standard Code for Design of Metro by comparing with the old standard Code for the design of metro, design standard of metro of Hongkong, national standard D. C. traction power supply system for urban rail transit, Shanghai local standard Urban rail transit design standard and so on, and pointed out the differences between them in the article, and it will provide advantage for the application of new Standard.